Markdown processor installed but showing invalid

I am using the rdiscount markdown which I installed using

$ gem install rdiscount
Building native extensions. This could take a while...
Successfully installed rdiscount-2.2.0.1
1 gem installed

But when I run my website locally it shows

$ bundle exec jekyll serve
...
 Incremental build: disabled. Enable with --incremental
      Generating... 
       Jekyll Feed: Generating feed for posts
Markdown processor: "rdiscount" is not a valid Markdown processor.
                    Available processors are: kramdown
                    
  Conversion error: Jekyll::Converters::Markdown encountered an error while converting '_posts/2014-05-10-this-is-a-sample.md':
                    Invalid Markdown processor given: rdiscount
             ERROR: YOUR SITE COULD NOT BE BUILT:
                    ------------------------------------
                    Invalid Markdown processor given: rdiscount

What is the issue and how to fix it?

Jekyll dropped support for rdiscount in version 4, so you’ll need to use Jekyll 3.

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